Genomic analysis of early SARS-CoV-2 variants introduced in Mexico - Taboada, B; Vazquez-Perez, JA; Muñoz-Medina, JE; Ramos-Cervantes, P; Escalera-Zamudio, M; Boukadida, C; Sanchez-Flores, A; Isa, P; Mendieta-Condado, E; Martínez-Orozco, JA; Becerril-Vargas, E; Salas-Hernández, J; et al. (Journal of Virology, 2020)